Certificate Revocation is a process through which we make sure that those certificates that are not considered valid are not used by relying parties.

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2answers
2k views

Is publishing CRLs over HTTP a potential vulnerability?

I noticed that at least one major CA (Comodo) publishes their CRL over HTTP rather than HTTPS. This seems to me to be somewhat of a vulnerability, as an attacker could hijack the HTTP connection that ...
12
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5answers
2k views

Why are certificates limited in time?

If a certificate has a limited duration of, say 5 years, but it gets somehow compromised after 2 years, waiting the 3 remaining years for it to get invalid is not a real solution to the breach problem....
12
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4answers
2k views

Why isn't OCSP required by default in browsers?

According to the following screenshot, taken from firefox-3.6.17-1.fc14.i686, Firefox has an option to fail closed when unable to connect to OCSP servers. Can someone please explain why this isn't ...
8
votes
1answer
2k views

Has the leaked D-Link windows signing key been revoked?

Recently news broke as to D-Link mistakenly publishing a private code-signing key as part of an open source framework. The D-Link key was leaked in late February, and expired on September 3, it ...
3
votes
3answers
294 views

The best way to change my pgp key

I would like to change my pgp key because I have the same one 2 years ago. But, I want to warn my freinds that the owner of the old key and the owner of the new one is the same person (me). hwat is ...
14
votes
3answers
283 views

Domain name expiration and TLS

If I purchase a domain name that has expired, do I have any assurance that the previous owner does not have a valid HTTPS certificate for the site? In other words, do CAs check domain name expiration ...
5
votes
1answer
5k views

AIA/CRL locations for Offline Root

I've read the answer to the following "Checklist on building an Offline Root & Intermediate Certificate Authority (CA)" and I have one questions based on the system I am trying building It's an ...
10
votes
1answer
571 views

Why can the validity of an SSL certificate exceed the registration period of a domain?

I can understand why one might desire to purchase a certificate for multiple years but I am left wondering why it appears to be possible to obtain a valid certificate for a domain that may have come ...
3
votes
1answer
433 views

How to handle CRLs correctly in long-term electronic signatures?

What is a recommended way of handling CRLs in long-term electronic signatures (specifically the CAdES-A)? The problem I see is in that CRLs are not protected against modification (they are plain text,...
6
votes
3answers
670 views

Why does OpenSSL need the private key to revoke a certificate?

openssl ca -revoke signed/0A.pem -config caconfig.cnf What does this do which requires the CA's private key? Does it do anything except updating index.txt?
3
votes
1answer
240 views

Is it a good idea to generate certificate-specific CRLs? What is this technique called?

Suppose I create 3 certificates with the following CRLs Cert1 http://crl.server.com/batch1/root1.crl Cert2 http://crl.server.com/batch2/root2.crl Cert3 http://crl.server.com/batch3/root3....
3
votes
1answer
205 views

How to trust a CA to sign a CRL but not a cert?

In my application, there are many parties that are trusted to revoke a cert (ie by signing a CRL), but are not trusted to sign (new) certs. How do I mark a CA to be trusted only for CRLs, and not for ...
2
votes
1answer
3k views

How does an offline CA revoke certificates?

If an RSA private key of a root CA is stored offline, how does it revoke certificates it signs? From looking at OpenSSL config the default_crl_days option seems to indicate that a CRL must be ...
1
vote
2answers
212 views

Can revoked certificates be “lost” if the base CRL is updated before expiration?

Assumption Suppose I have a CA that issues a base and a Freshest CRL. I also understand the Freshest CRL to be a Delta of revoked certs in the base. I also understand that clients should pull the ...
0
votes
2answers
8k views

Trying to get rid of hackers who have access to all my devices [closed]

What is the best way to go about getting rid of hackers that have gained access to all my personal computers, (both old and recently purchased) phones, and even random computers I use to simply get ...
10
votes
1answer
225 views

Did D-Link's certificate revocation really only invalidate 1 day (of a six months long exposure)?

I'm trying to wrap my head around the OCSP revocationTime for D-Link's certificate. I recently answered another question and ended up drafting a timeline. That timeline is basically this: Jul 5 00:...
5
votes
2answers
127 views

Why do so many browsers show sites with revoked certificates?

Everyone seems to agree that it is REALLY important to protect private keys so the encrypted Internet can remain just that (see for example at How do certification authorities store their private root ...
5
votes
3answers
832 views

Certificate Transparency

From what I read here, if the intermediate CA has been compromised, a fake cert can be issued and the privacy of the end-users could be compromised as well. In order to remediate this situation, ...
3
votes
1answer
22 views

Do I need separate revocation certificates for each email address associated with a key?

I just created my first OpenPGP key with GnuPG + Thunderbird + Enigmail. The key is used for two email addresses. Now I created a revocation certificate. There is only on of the email addresses ...
2
votes
1answer
374 views

Signature and Timestamp for Long Term Document Archival Question

I have a PDF document intended for long-term (many years, maybe decades) archival which I would like to digitally sign with my personal certificate to ensure its integrity. As far as I understand, I ...